How to make your own sound bag

As a documentarian and filmmaker who also started to record his own location sound and field recordings, I was looking for a custom sound bag solution for my individual workflow. Yes, there are awesome companies like Protogear, but they are pricy, which I absolutely understand, and I wasn’t sure about every detail I wanted to have on my bag. After months of research and scratching my head I came up with the crazy idea to make it by myself. But how? If you know sound bags for location sound applications, then you know that they are built very sturdy for tough environments and that they have a quite…